A subframe brace fits between the two A-arms on the front suspension and ties the lower suspension together to eliminate lower A-arm flex during hard cornering. This gives a much more consistent feel and stability to the suspension under hard cornering. Subframe braces do hang low enough that clearance over road obstacles could be an issue, especially if your car is lowered.
RK Sport, Mantapart and Control F/X make subframe braces for the third gen J-body. Subframe braces are also easily custom made out of square steel or aluminum and a couple of bolts.
